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Viewing file:     Class.js (3.25 KB)      -rwxrwxr-x

import * as Util from './Util';

// @class Class
// @aka L.Class

// @section
// @uninheritable

// Thanks to John Resig and Dean Edwards for inspiration!

export function Class() {}

Class.extend = function (props) {

	// @function extend(props: Object): Function
	// [Extends the current class](#class-inheritance) given the properties to be included.
	// Returns a Javascript function that is a class constructor (to be called with `new`).
	var NewClass = function () {

		// call the constructor
		if (this.initialize) {
			this.initialize.apply(this, arguments);
		}

		// call all constructor hooks
		this.callInitHooks();
	};

	var parentProto = NewClass.__super__ = this.prototype;

	var proto = Util.create(parentProto);
	proto.constructor = NewClass;

	NewClass.prototype = proto;

	// inherit parent's statics
	for (var i in this) {
		if (Object.prototype.hasOwnProperty.call(this, i) && i !== 'prototype' && i !== '__super__') {
			NewClass[i] = this[i];
		}
	}

	// mix static properties into the class
	if (props.statics) {
		Util.extend(NewClass, props.statics);
		delete props.statics;
	}

	// mix includes into the prototype
	if (props.includes) {
		checkDeprecatedMixinEvents(props.includes);
		Util.extend.apply(null, [proto].concat(props.includes));
		delete props.includes;
	}

	// merge options
	if (proto.options) {
		props.options = Util.extend(Util.create(proto.options), props.options);
	}

	// mix given properties into the prototype
	Util.extend(proto, props);

	proto._initHooks = [];

	// add method for calling all hooks
	proto.callInitHooks = function () {

		if (this._initHooksCalled) { return; }

		if (parentProto.callInitHooks) {
			parentProto.callInitHooks.call(this);
		}

		this._initHooksCalled = true;

		for (var i = 0, len = proto._initHooks.length; i < len; i++) {
			proto._initHooks[i].call(this);
		}
	};

	return NewClass;
};


// @function include(properties: Object): this
// [Includes a mixin](#class-includes) into the current class.
Class.include = function (props) {
	Util.extend(this.prototype, props);
	return this;
};

// @function mergeOptions(options: Object): this
// [Merges `options`](#class-options) into the defaults of the class.
Class.mergeOptions = function (options) {
	Util.extend(this.prototype.options, options);
	return this;
};

// @function addInitHook(fn: Function): this
// Adds a [constructor hook](#class-constructor-hooks) to the class.
Class.addInitHook = function (fn) { // (Function) || (String, args...)
	var args = Array.prototype.slice.call(arguments, 1);

	var init = typeof fn === 'function' ? fn : function () {
		this[fn].apply(this, args);
	};

	this.prototype._initHooks = this.prototype._initHooks || [];
	this.prototype._initHooks.push(init);
	return this;
};

function checkDeprecatedMixinEvents(includes) {
	if (typeof L === 'undefined' || !L || !L.Mixin) { return; }

	includes = Util.isArray(includes) ? includes : [includes];

	for (var i = 0; i < includes.length; i++) {
		if (includes[i] === L.Mixin.Events) {
			console.warn('Deprecated include of L.Mixin.Events: ' +
				'this property will be removed in future releases, ' +
				'please inherit from L.Evented instead.', new Error().stack);
		}
	}
}